Locomotive valve-gear.



W. 8% BROWN LOOOMOTIVE VALVE am.

I I APILIOA TIOH FILED HA3. 12, 19,03, 9561,0566, Patented Oct. 13,1908.

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Attwnay PATENT orrion;

WILLIAM s. m ws,- or KNOXVILLE, TENNESSEE.

LocoiromivnvaLvn-enaa.

- Specification of'Letters Patent.

Patented Oct. 13, 1908.

Application fiieim h 12, 1908. Serial M42031.

. To all whom it mag concern:

BROWN, a citizen of the United States, re-' I siding at Knoxville,

in the county of Knox and State of Tennessee, have invented a new anduseful Improvement in Locomotive Valve-Gears, of which the following isaccompanying drawing.

My improvement relates particularly to mechanism for transmitting motionfrom a specification, reference being had to the the connecting rod orpitman of a locomotive to the valve which admits steam to the cylinder.

The objects of the improvement are to provide a construction which issimple and which avoids irregularity of valve 'actiondue to lost motionor pounding at the crank and the parts of which are accessibly located.

In the accompanying drawings, Figure 1 'is a side elevation, portionsbeing brokenaway, showing my improvement applied to one side of alocomotive; Fig. 2 is a plan ofa portion of the mechanism shown by Fig."

1; Fig. 3 is a. section on the'line 33 of Fig-1, looking in thedirection of the arrow; Flg. 41s a section onthe line H, of

Fig. 1, looking in the direction of-the arrow; F 1g. 5 is-a detail planshow ng a connection between the connecting rod or pitmanand anothermember of. the apparatus; Fig. 6 is a detail perspective'of'a link andan arm attached thereto; Fig. 7 is a horizontal detail sectionthroughthe 'upper half of the reversing link.

Referring to said drawings, 1' is the cylinder, 2 is the valve chest, 3is the slide 'valve located within said chest, 4 is the usual. valvestem casing. 1

The ordinary piston, 8, 1s located w thin extending through said saidcylinder and has applied to itthe ordinary piston rod, 9,'which isjoined to the ordinary cross-head, '10, confinedbetween the usualhorizontal, parallel guide-bars, 'i. To saidcross-h'cad is coupled oneend of the usual connecting rod or pitman, 11, the other end of saidrodv being coupled to the usual crank, 12.

' On a bracket, 13,'is journa1ed ahorizontal' rock-shaft, 1 l, (thereisa similar bracket, not shown, at the other side of the engine, in whichsaid shaft is also journaled) and i rom said rock-shaft rises an arm,15, to the .upper end of said link, 24,-is coupled free end of'which iscoupled a'rod, 16, the Be itknown that I, WILLIA SHERMAN other.endofwhich rod is coupled to the tending through said link andsecured'therein bya vertically slidable pivot. A link,

21, is coupled to a horizontal arm, 22, of the rock-shaft, 14, and theadjacent end of said bar, 20. "The other end of said bar, 20. is

coupled .to a forked link,v23, between the ends.- of the latter,,thelower end of which link is coupled to the approximately up.-

. right link 24:, a littl'e wa'y below the lower end of the latter, andthe upper end of which'link, 23, is coupled to a bracket, 24,

secured tothe boiler, B." To the cross-head,

10-, is coupled one end of an approximately horizontal link, 10, and tothe opposite end of said link is,ceupled the lower end of the link, 24,and; as above stated, the link, 24,

is coupled to the link, 23, a little way below the upper end of thelink, 24, and to the the outer end of the valve stem, 4.

To'theouter face of the connecting rod or pitman, 11, is applied aswiveled guideblock, 25, by means of a stem, 26, extending rearwardthrough said rod and surrounded at the backof said rod by a nut, 27, orsimilar means for keeping said stem in position, the front of said blockbeing horizontally slotted for the passage of thearm,33, describedbelow. (See Figs. 1, 2, and 5.)

From the upper parallel guide-bar, 7, a bracket, 28, extends downward,anda bar, 29, is hinged to said bracket at 30. Said bar extends,slidably through said guideblock, 25. f I a On the reversing link, 18,is an approximately horizontalrigid arm, 31 and to the outer end ofsaid-arm is coupled the upper 'end' of an approximately upright link,32, the lower end of said link being coupled to theouter end' ofa shortarm, 33, on the bar, '29, which, as above'described, rests slidably inthe swiveled guide-block, 25. 'During the movement of the connecting rodand the guide-block 25, said block passes to each side of the arm; 33. a

.- The-operation will be readily understood from 'an inspection .of thedrawings. The axis of the bar, 29, being fixed, and the guide-block, 25,being slidable on said bar and swiveled tothe main rod, said guideibloei: willris'eand fall and slide on said bai toward and from the axisor joint of said arm. Theilp and down movement of said "guide-blockraises and lovvers the free end of 5 said bar, whereby oscillatorymotion is imparted. to the link, 32, and through the latter to the arm,31, and the reversing link, 18. The oscillation of said reversing linkcauses the oscillation of the link, 20, and the 10 oscillation of thelink, 23; and the oscillation ofthe link, 23, causes the oscillation ofthe link, 24. But such movement of the link, 2d, is-modified by themovement of the link, 10. with the cross head, 10. The move- 15 ments ofthe reversing link and the cross head are preferably so timed asthateachwill act upon the valve stem in the same direction-during the openingand closing of the valve ports, whereby the movement of 2 the valve atsuch'tiines is accelerated.

It is to be observed that only three pieces are used to transmitmotiont'rom the connecting rod to the reversing link, and that thetransverse, and not the longitudinal,

5 motion of the connecting rod is transmitted. so that an irregularlengthwise movement of the. connecting rod due to lost motion or ipounding at the crank is not transmitted to the reversing link. And itwill be ob- 80 served, on inspecting Figs. 1 andQ, that the portions ofthe transmitting mechanism between theconnecting rod and the valve stemare all applied outside of the space occupied and traversed by the driveWheels, D, and

35 theparallel rod, 3%. The-adaptation of my mechanism to thisarrangement is an important- .feature; for there is no available spacebetween the connecting rod and the parallel rod and drive Wheels,'Fnrthermore, all of this mechanism is readily acceasiblc forinspection, cleaning, oiling, adjustment, or repairing.

comes" I claim as my invention: l. ln a valve gear for locomotives,

combination of agnide-bl azk jouruulw i m the engine connecting rod, abar slidalin said guide-block and hinged at a. i'clutl'i lixed point, areversing link in opcrali relation with the distributingvalve oi" theengine,'an arm rigid with said link, and a link joining said arm andsaid bar, substan tially as described.

2. In a valve gear for locomotives, the combination of a guide-blockjournaled lo the engine connecting rod, a bar slid-able in saidguide-block and hinged at a relatively fixed point. a reversing link, anarm rigid with said link, a link joining said arm and said bar, a bar,20, leading from the reversing link, a link, 23, hinged to a fixedsupport. and coupled to said bar, and a link, 2 1, coupled to said link,23, and to the valve stem, substantially as described. I

3. In a valve gear for locomotives, the combination of aguide-blockjournaled to the engine connect-ing rod, a bar slidable insaid guide-block and hinged at a relativelv fixed point, a. reversinglink, an arm rigid with said link, a link joining said arm and said bar,a bar, 20, leading from the reversing link. a link, 23, hinged'to afixed sup 'rort and coupled to said bar, a link, 24-. coupled to saidlink. 23, and to the-valve stem, and a link, 10. coupled totl1e.eross-l1ez1d and to the link, 24, substantially as described.

In testimony whereof have signed my name, in presence of two witnesses,this Tlh da) of March, in the year one thousand nine hundred and eight.

\YlLLlAM b5. llll l N.

\Yitnesscs (vars liruu, ll. C. l'lenrnlxsox.

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